EP3895912A1 - Luftreifen - Google Patents

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Publication number
EP3895912A1
EP3895912A1 EP21168091.3A EP21168091A EP3895912A1 EP 3895912 A1 EP3895912 A1 EP 3895912A1 EP 21168091 A EP21168091 A EP 21168091A EP 3895912 A1 EP3895912 A1 EP 3895912A1
Authority
EP
European Patent Office
Prior art keywords
sound
damping body
sealant layer
tire
pneumatic tire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP21168091.3A
Other languages
English (en)
French (fr)
Other versions
EP3895912B1 (de
Inventor
Naoki Yukawa
Takuya Sato
Sho Matsunami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Rubber Industries Ltd
Original Assignee
Sumitomo Rubber Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Publication of EP3895912A1 publication Critical patent/EP3895912A1/de
Application granted granted Critical
Publication of EP3895912B1 publication Critical patent/EP3895912B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C19/00—Tyre parts or constructions not otherwise provided for
    • B60C19/002—Noise damping elements provided in the tyre structure or attached thereto, e.g. in the tyre interior
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/02—Carcasses
    • B60C9/12—Carcasses built-up with rubberised layers of discrete fibres or filaments

Definitions

  • the present invention relates to a pneumatic tire and specifically relates to a pneumatic tire including a sealant layer on the tire inner cavity side of a tread portion thereof.
  • the present invention has been made in view of the above-described problem, and a main object of the present invention is to provide a pneumatic tire that can suppress a decrease in air sealing performance while suppressing noise.
  • the present invention is directed to a pneumatic tire including: a tread portion; a self-sealing sealant layer disposed on a tire inner cavity side of the tread portion; and a sound-damping body attached to the sealant layer, wherein the pneumatic tire is configured such that, when a foreign matter that has penetrated the tread portion comes into contact with the sound-damping body, the sound-damping body becomes separated from the sealant layer.
  • an adhesive force between the sound-damping body and the sealant layer may be 0.10 to 5.0 (N/cm 2 ).
  • the sound-damping body may have an elongation of 100% to 400%.
  • the sound-damping body may have a hardness of 10 to 250 (N/314 cm 2 ).
  • the sound-damping body may be a sponge.
  • the sound-damping body may be an ether/ester-based mixed polyurethane sponge.
  • the sound-damping body may be in direct contact with the sealant layer.
  • FIG. 1 is a cross-sectional view of a pneumatic tire 1 according to an embodiment.
  • the pneumatic tire 1 is, for example, a tubeless tire having a radial structure, and is formed in a toroidal shape including a tread portion 2, a pair of sidewall portions 3, and a pair of bead portions 4.
  • a non-stretchable bead core 5 is embedded in each of the pair of bead portions 4.
  • the pneumatic tire 1 also includes, for example, a carcass 6 extending on and between the bead cores 5, a belt layer 7 disposed outward of the carcass 6 in the tire radial direction and within the tread portion 2, and a tread rubber 8 disposed outward of the belt layer 7.
  • a carcass 6 extending on and between the bead cores 5
  • a belt layer 7 disposed outward of the carcass 6 in the tire radial direction and within the tread portion 2
  • a tread rubber 8 disposed outward of the belt layer 7.
  • These elements can be provided as appropriate according to a conventional manner.
  • a band layer including a reinforcing cord extending in the tire circumferential direction, or the like may be disposed between the belt layer 7 and the tread rubber 8 (not shown).
  • an inner liner layer 9 is disposed over substantially the entire region thereof.
  • the inner liner layer 9 is formed from an air-impermeable rubber such as an isobutylene-isoprene-rubber, prevents permeation of the air in the tire inner cavity i, and maintains air sealing performance.
  • the pneumatic tire 1 includes a self-sealing sealant layer 10 disposed on the tire inner cavity i side of the tread portion 2, and a sound-damping body 12 attached to the sealant layer 10.
  • the sealant layer 10 is disposed on the tire inner cavity i side of the tread portion 2, that is, inward of the inner liner layer 9.
  • the sealant layer 10 of the present embodiment is made from a sealant material having predetermined adhesiveness, viscosity, and fluidity, and is formed by applying the sealant material to the inner cavity side of the tread portion 2.
  • the sealant layer 10 is preferably formed so as to have a thickness of, for example, 1 mm or greater and preferably 2 mm or greater in order to exhibit air sealing performance at the time of puncture.
  • the sealant material adheres to the periphery of the nail so as to cover the nail that has projected into the tire inner cavity i, thereby preventing air leakage.
  • a through hole is formed in the tread portion 2, but the sealant material can enter the through hole due to the tire internal pressure with movement of the nail, thereby sealing the through hole.
  • the self-sealing sealant layer 10 of the present embodiment has such two functions.
  • the sealant layer 10 is preferably formed, for example, in a region where treading on a nail, or the like, is likely to occur. From such a viewpoint, the sealant layer 10 is preferably formed over a ground-contact region, of the tread portion 2, which is brought into contact with a road surface. In another embodiment, the sealant layer 10 may be disposed beyond the ground-contact region of the tread portion 2.
  • the "ground-contact region” is a ground-contact region in a standard running state of the pneumatic tire 1, and may be, for example, a region that is brought into contact with a road surface at a camber angle of 0° under a normal load after the pneumatic tire 1 is mounted to a normal rim and adjusted to a normal internal pressure.
  • the "normal rim” is a rim that is defined, in a standard system including a standard on which the tire is based, by the standard for each tire, and is, for example, the "standard rim” in the JATMA standard, the “Design Rim” in the TRA standard, or the “Measuring Rim” in the ETRTO standard.
  • the "normal internal pressure” is an air pressure that is defined, in a standard system including a standard on which the tire is based, by the standard for each tire, and is the “maximum air pressure” in the JATMA standard, the maximum value indicated in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" in the TRA standard, or the “INFLATION PRESSURE” in the ETRTO standard.
  • the "normal load” is a load that is defined, in a standard system including a standard on which the tire is based, by the standard for each tire, and is the “maximum load capacity" in the JATMA standard, the maximum value indicated in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" in the TRA standard, or the "LOAD CAPACITY" in the ETRTO standard.
  • the sealant material typically includes a rubber component, a liquid polymer, a crosslinking agent, etc.
  • the rubber component for example, a butyl-based rubber such as isobutylene-isoprene-rubber and halogenated isobutylene-isoprene-rubber is adopted.
  • a butyl-based rubber and a diene-based rubber may be blended and used.
  • the amount of the butyl-based rubber in 100 parts by weight of the rubber component is preferably not less than 90 parts by weight.
  • liquid polymer examples include liquid polybutene, liquid polyisobutene, liquid polyisoprene, liquid polybutadiene, liquid poly- ⁇ -olefin, liquid isobutylene, liquid ethylene- ⁇ -olefin copolymers, liquid ethylene-propylene copolymers, and liquid ethylenebutylene copolymers.
  • liquid polybutene is particularly preferable.
  • the amount of the liquid polymer may be determined as appropriate in consideration of the adhesiveness of the sealant material, but the amount of the liquid polymer per 100 parts by weight of the rubber component is preferably not less than 50 parts by weight and more preferably not less than 100 parts by weight. In addition, when the fluidity, etc., of the sealant material are taken into consideration, the amount of the liquid polymer per 100 parts by weight of the rubber component is preferably not greater than 400 parts by weight and more preferably not greater than 300 parts by weight.
  • the crosslinking agent a compound that is conventionally used can be used, and, for example, an organic peroxide is preferable.
  • an organic peroxide is preferable.
  • Use of the butyl-based rubber or the liquid polymer in an organic peroxide crosslinking system improves the adhesiveness, the sealing performance, the fluidity, processability, etc.
  • the organic peroxide for example, acyl peroxides are preferable, and dibenzoyl peroxide is particularly preferable.
  • the amount of the organic peroxide (crosslinking agent) per 100 parts by weight of the rubber component is preferably not less than 0.5 parts by weight and further preferably not less than 1.0 part by weight. If the amount is less than 0.5 parts by weight, the crosslink density may decrease, resulting in flow of the sealant material.
  • the upper limit of the amount is preferably not greater than 40 parts by weight and further preferably not greater than 20 parts by weight. If the amount is greater than 40 parts by weight, the crosslink density may increase, resulting in a decrease in sealing performance.
  • the sound-damping body 12 is attached to the inner side of the sealant layer 10.
  • the surface of the sound-damping body 12 on the outer side in the tire radial direction is in direct contact with the sealant layer 10, and the sound-damping body 12 is held on the sealant layer 10 by the adhesiveness of the sealant layer 10.
  • the sound-damping body 12 is, for example, a sponge-like porous structure, and is formed of, for example, a sponge obtained by foaming a rubber or synthetic resin.
  • the sound-damping body 12 is formed of a sponge having open cells. The pores on the surface of and/or inside the sponge convert the vibrational energy of the air in the tire inner cavity i into thermal energy. Therefore, the sound-damping body 12 can reduce resonance noise and the like during tire running.
  • the material, etc., of the sponge are not particularly limited, but, for example, a polyurethane sponge having excellent weather resistance, and the like are suitable, and among them, an ether/ester-based mixed polyurethane sponge is preferable.
  • the sound-damping body 12 is configured, for example, by disposing a belt-shaped sponge having a rectangular cross-sectional shape, in a substantially annular shape along the tire circumferential direction. In another embodiment, the sound-damping body 12 may be provided intermittently in the tire circumferential direction.
  • the shape and the size of the sound-damping body 12 are not particularly limited, and may be determined as appropriate such that noise during tire running can be reduced.
  • FIGS. 2(A) to 2(C) schematically show a state when a nail 20 as a foreign matter penetrates the tread portion 2.
  • FIG. 2(A) shows a state where the tip of the nail 20 has been stuck into the tread portion 2. Here, the nail 20 has not yet penetrated the tread portion 2.
  • FIG. 2(B) shows a state where the nail 20 has pierced deeper into the tread portion 2.
  • the pneumatic tire 1 according to the present embodiment is configured such that, as shown in FIG. 2(B) , when the nail 20 having penetrated the tread portion 2 comes into contact with the sound-damping body 12, the sound-damping body 12 becomes separated from the sealant layer 10.
  • the pneumatic tire 1 is configured such that, when a JIS N100 round nail (body diameter: 4.2 mm) is perpendicularly driven into the tread portion 2 (groove bottom portion) of the pneumatic tire 1 in a normal state at a driving speed of 10 mm/s by a length of 40 mm, the sound-damping body 12 around the nail becomes separated from the sealant layer 10.
  • the sound-damping body 12 receives a force toward the inner side in the tire radial direction due to contact with the tip of the nail 20 and is pushed upward so as to become partially separated from the sealant layer 10. Therefore, the nail 20 is prevented from piercing the sound-damping body 12, and destruction of the sound-damping body 12 is suppressed.
  • FIG. 2(C) shows a state where the nail 20 has fallen out of the tread portion 2 and a through hole 2a has been formed in the tread portion 2.
  • destruction of the sound-damping body 12 due to the piercing of the nail 20 is suppressed, so that a broken piece of the sound-damping body 12 does not enter the through hole 2a. Therefore, the sealant material which is the sealant layer 10 can enter the through hole 2a without being disturbed by a broken piece of the sound-damping body 12, etc., and can exhibit an air sealing effect.
  • the adhesive force between the sound-damping body 12 and the sealant layer 10 is, for example, not greater than 5.0 (N/cm 2 ) and preferably not greater than 3.0 (N/cm 2 ).
  • the adhesive force between the sound-damping body 12 and the sealant layer 10 is preferably adjusted to be, for example, not less than 0.10 (N/cm 2 ) and preferably not less than 0.50 (N/cm 2 ).
  • the adhesive force between the sound-damping body 12 and the sealant layer 10 is measured as follows. First, a test piece having a rectangular parallelepiped shape with a thickness of 10 mm and an adhesion surface formed as a square of 30 mm ⁇ 30 mm is cut out from the sound-damping body 12, and the adhesion surface of the test piece is brought into close contact with the flat sealant layer 10. The opposite surface of the test piece from the adhesion surface is firmly adhered to a jig.
  • test piece is pulled perpendicularly to the sealant layer 10 using the jig, the force when the test piece is peeled off from the sealant layer 10 is measured, and an adhesive force is obtained by dividing this force by the area of the adhesion surface of the test piece.
  • the tensile speed of the jig is set to 300 mm/min.
  • An example of the method for decreasing the adhesive force between the sound-damping body 12 and the sealant layer 10 is a method of reducing the addition amount of the liquid polymer in the composition of the sealant material.
  • the adhesive force of the sealant layer 10 to the sound-damping body 12 can also be decreased by, for example, applying warm air to the sealant layer 10, drying the sealant layer 10, or irradiating the sealant layer 10 with ultraviolet rays after the sealant layer 10 is applied and formed on the tread portion 2.
  • the sound-damping body 12 is not particularly limited, but, for example, preferably has an elongation of 100% or greater and more preferably 150% or greater. Elastic deformation of such a sound-damping body 12 is easily promoted at the time of contact with a foreign matter, and piercing of the foreign matter into the sound-damping body 12 is further suppressed. In addition, the sound-damping body 12 tends to exhibit a higher noise-reduction effect as the elongation thereof is larger. Thus, such a sound-damping body 12 is preferable from the viewpoint of both air sealing performance and noise performance.
  • the elongation of the sound-damping body 12 is, for example, not greater than 400% and preferably not greater than 300%. In the present description, the elongation of the sound-damping body 12 is defined as the elongation when the test piece is broken, in accordance with JIS K6400-5 (2012).
  • the hardness of the sound-damping body 12 is not particularly limited. However, when the hardness of the sound-damping body 12 is excessively low, a foreign matter easily pierces the sound-damping body 12 at the time of contact with the foreign matter. From such a viewpoint, the hardness of the sound-damping body 12 is, for example, not less than 10 (N/314 cm 2 ) and preferably not less than 100 (N/314 cm 2 ). On the other hand, when the hardness of the sound-damping body 12 is excessively high, the noise reduction effect of the sound-damping body 12 may be relatively decreased.
  • the hardness of the sound-damping body 12 is, for example, not greater than 250 (N/314 cm 2 ) and preferably not greater than 200 (N/314 cm 2 ).
  • the hardness of the sound-damping body 12 is defined as the hardness measured on the basis of the D method of the hardness test of JIS K6400-2 (2012).
  • a plurality of kinds of pneumatic tires having the basic structure in FIG. 1 and having a sealant layer and a sound-damping body were produced as test tires on the basis of specifications in Table 1.
  • the composition of each sealant material is as shown in Table 2.
  • the common specifications of each tire are as follows.
  • Sound-damping body polyurethane sponge (width: 200 mm, thickness: 10 mm, length: 1900 mm) Width in tire axial direction of sealant layer: 190 mm Thickness of sealant layer: about 3 mm
  • the following tests were carried out on each tire.
  • a test piece having a rectangular parallelepiped shape with a thickness of 10 mm and an adhesion surface formed as a square of 30 mm ⁇ 30 mm was cut out from the sound-damping body, and the adhesion surface of the test piece was brought into close contact with the flat sealant layer.
  • the opposite surface of the test piece from the adhesion surface was firmly adhered to a jig.
  • the test piece was pulled perpendicularly to the sealant layer using the jig, the force when the test piece was peeled off from the sealant layer was measured, and an adhesive force was obtained by dividing this force by the area of the adhesion surface of the test piece.
  • the tensile speed of the jig was set to 300 mm/min.
  • each test tire was fitted to a rim and adjusted to the initial internal pressure.
  • 20 nails were driven into a circumferential groove of each test tire at groove bottom positions at regular intervals by a length of 40 mm so as to penetrate the tread portion.
  • each test tire was removed from the rim, and whether the sound-damping body was separated from the sealant layer was observed with the naked eye ("presence/absence of separation of sound-damping body” in Table 1). If separation occurs even at one location, it is evaluated as "presence”.
  • As the nails JIS N100 round nails (body diameter: 4.2 mm) were used.
  • each test tire was fitted to the rim again, the nails were removed therefrom, and the test tire was filled to the internal pressure and left for 24 hours. Thereafter, the number of locations where the nail hole was sealed by the sealant layer was measured (an item of "number of air-sealed locations" in Table 1).
  • Each test tire was fitted to a rim and adjusted to the initial internal pressure. Next, the above nails were cut into a length of 40 mm, one of the nails was driven into the bottom of a circumferential groove on the tread portion of the tire until the head of the nail reached the tread portion, and running was performed on a test course for about 0.5 hours. Thereafter, the tire was removed from the rim, and the presence/absence of separation or damage of the sound-damping body was checked.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
EP21168091.3A 2020-04-15 2021-04-13 Luftreifen Active EP3895912B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2020073006A JP7484365B2 (ja) 2020-04-15 2020-04-15 空気入りタイヤ

Publications (2)

Publication Number Publication Date
EP3895912A1 true EP3895912A1 (de) 2021-10-20
EP3895912B1 EP3895912B1 (de) 2023-09-27

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EP21168091.3A Active EP3895912B1 (de) 2020-04-15 2021-04-13 Luftreifen

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EP (1) EP3895912B1 (de)
JP (1) JP7484365B2 (de)
CN (1) CN113524988B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4206000A1 (de) * 2021-12-28 2023-07-05 Sumitomo Rubber Industries, Ltd. Luftreifen
EP4206001A1 (de) * 2021-12-28 2023-07-05 Sumitomo Rubber Industries, Ltd. Luftreifen

Citations (6)

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JP3787343B2 (ja) 2003-11-07 2006-06-21 住友ゴム工業株式会社 空気入りタイヤとリムとの組立体
EP3093165A1 (de) * 2014-01-30 2016-11-16 Sumitomo Rubber Industries, Ltd. Reifen mit dichtungsmittel
JP2017065673A (ja) 2014-10-17 2017-04-06 住友ゴム工業株式会社 空気入りタイヤ、空気入りタイヤの製造方法
EP3461658A1 (de) * 2017-10-02 2019-04-03 Sumitomo Rubber Industries, Ltd. Pneumatischer reifen mit geräuschdämpfer
WO2019078280A1 (ja) * 2017-10-19 2019-04-25 横浜ゴム株式会社 空気入りタイヤ
EP3552849A1 (de) * 2018-04-11 2019-10-16 Continental Reifen Deutschland GmbH Fahrzeugluftreifen mit geräuschabsorber und klebemittelzusammensetzung zur befestigung wenigstens eines geräuschabsorbers auf einer fläche eines fahrzeugluftreifens

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JP3787343B2 (ja) 2003-11-07 2006-06-21 住友ゴム工業株式会社 空気入りタイヤとリムとの組立体
EP3093165A1 (de) * 2014-01-30 2016-11-16 Sumitomo Rubber Industries, Ltd. Reifen mit dichtungsmittel
JP2017065673A (ja) 2014-10-17 2017-04-06 住友ゴム工業株式会社 空気入りタイヤ、空気入りタイヤの製造方法
EP3461658A1 (de) * 2017-10-02 2019-04-03 Sumitomo Rubber Industries, Ltd. Pneumatischer reifen mit geräuschdämpfer
WO2019078280A1 (ja) * 2017-10-19 2019-04-25 横浜ゴム株式会社 空気入りタイヤ
EP3552849A1 (de) * 2018-04-11 2019-10-16 Continental Reifen Deutschland GmbH Fahrzeugluftreifen mit geräuschabsorber und klebemittelzusammensetzung zur befestigung wenigstens eines geräuschabsorbers auf einer fläche eines fahrzeugluftreifens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4206000A1 (de) * 2021-12-28 2023-07-05 Sumitomo Rubber Industries, Ltd. Luftreifen
EP4206001A1 (de) * 2021-12-28 2023-07-05 Sumitomo Rubber Industries, Ltd. Luftreifen

Also Published As

Publication number Publication date
CN113524988B (zh) 2024-02-23
JP2021169261A (ja) 2021-10-28
EP3895912B1 (de) 2023-09-27
JP7484365B2 (ja) 2024-05-16
CN113524988A (zh) 2021-10-22

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